does LDM lock files in transmission?

Hi all,
I'm writing an application that will process some real-time data I'm
ingesting through LDM. This application will run around the clock in
the cron, so it needs to be fairly robust. Here's my question - say I
ingest a file via LDM. How do I know that file is complete? Does LDM
place some sort of lock or other information on the file before it's
completed writing? If my application tries to access a file that does
not contain all the necessary data (a file that still has yet to be
completely transmitted, for example), then I need to have my application
not process the file.
Does anyone else out there have experience with this? I know there's
tricks you can perform, such as checking to see if the file has been
modified in the past 30 seconds before opening, etc., etc., but I was
just wondering if LDM actually places some sort of information with the
file that says "hey, this file isn't done yet". Thanks for any help!
Jason
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Jason J. Levit, N9MLA Research Scientist,
jlevit@xxxxxx Center for Analysis and Prediction of Storms
Room 1022 University of Oklahoma
405/325-3503 http://www.caps.ou.edu/